<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mi>ψ</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mo stretchy="false">)</mml:mo></mml:math>Production at the Tevatron and LHC at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">O</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msubsup><mml:mi>α</mml:mi><mml:mi>s</mml:mi><mml:mn>4</

Ma, Yan-Qing; Wang, Kai; Kong, Chao

doi:10.1103/physrevlett.106.042002

Cited by 277 publications

(390 citation statements)

References 37 publications

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“…Recent NRQCD calculations [20] include color singlet and color octet NLO short range terms along with a long-range matrix parametrization from experimental hadroproduction [21] and photoproduction [22,23] of J/ψ mesons. A similar study was performed using CDF data with consistent results [24]. However, the NLO terms for the color octet [25] have only small corrections compared to the leading-order (LO) terms and the calculations still disagree with the J/ψ polarization measured by CDF.…”

mentioning

confidence: 84%

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Adare¹,

Afanasiev²,

Aidala³

et al. 2012

Phys. Rev. D

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We report on charmonium measurements [J/ψ (1S), ψ ′ (2S), and χc (1P)] in p+p collisions at √ s = 200 GeV. We find that the fraction of J/ψ coming from the feed-down decay of ψ ′ and χc in the midrapidity region (|y| < 0.35) is 9.6 ± 2.4% and 32 ± 9%, respectively. We also present the pT and rapidity dependencies of the J/ψ yield measured via dielectron decay at midrapidity (|y| < 0.35) and via dimuon decay at forward rapidity (1.2 < |y| < 2.2). The statistical precision greatly exceeds that reported in our previous publication [Phys. Rev. Lett. 98, 232002 (2007)]. The new results are compared with other experiments and discussed in the context of current charmonium production models.

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mentioning

confidence: 84%

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Adare¹,

Afanasiev²,

Aidala³

et al. 2012

Phys. Rev. D

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“…They are compared with theoretical predictions from NRQCD [3] and from FONLL [5,6] for the prompt and non-prompt cases, respectively. Numerical values are also reported in ref.…”

Section: Prompt and Non-prompt Cross Sections Corrected For Acceptancementioning

confidence: 99%

J/ψ and ψ(2S) production in pp collisions at $ \sqrt {s} = 7{\text{Tev}} $

Chatrchyan¹,

Khachatryan²,

Sirunyan³

et al. 2012

J. High Energ. Phys.

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A measurement of the J/ψ and ψ(2S) production cross sections in pp collisions at $ \sqrt {s} = 7{\text{TeV}} $ with the CMS experiment at the LHC is presented. The data sample corresponds to an integrated luminosity of 37 pb−1. Using a fit to the invariant mass and decay length distributions, production cross sections have been measured separately for prompt and non-prompt charmonium states, as a function of the meson transverse momentum in several rapidity ranges and integrated in the kinematical regions considered in this study. In addition, cross sections restricted to the acceptance of the CMS detector are given, which are not affected by the polarization of the charmonium states. The ratio of the differential production cross sections of the two states, where systematic uncertainties largely cancel, is also determined. The branching fraction of the inclusive B → ψ(2S)X decay is extracted from the ratio of the non-prompt cross sections to be: $ \mathcal{B}\left( {{\text{B}} \to \psi \left( {\text{2S}} \right)X} \right) = \left( {{3}.0{8}\pm 0.{12}\left( {{\text{stat}}. + {\text{syst}}.} \right)\pm 0.{13}\left( {{\text{theor}}.} \right)\pm 0.{42}\left( {{\mathcal{B}_{\text{PDG}}}} \right)} \right) \times {1}{0^{{ - {3}}}}. $

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“…[145,30,29] is denoted here as "BK" ii , while the Chinese groups associated with Refs. [31,32] ( [33,34]) are denoted here as "GWWZ" ("CMSWZ").…”

Section: Nrqcd Analyses Reviewmentioning

confidence: 99%

“…The CMSWZ group provides an independent calculation of the SDCs [33] and polarization observables [34] of the CS and the individual CO states. An independent extraction of the J/ψ LDMEs is attempted with a fit to hadroproduction data only, restricted to CDF measurements.…”

Section: Cmswz Nrqcd Analysesmentioning

confidence: 99%

“…Moreover, the experimental results of the analyses described in this thesis, together with other results in the quarkonium production sector from the LHC experiments, can be interpreted in a much more rigorous way than previously possible, due to the higher p T reach and the usage of more reliable experimental techniques for the estimation of the polarizations of the quarkonium states. Several state-of-the-art NLO NRQCD analyses can be found in the literature, affected by various problems leading to contradictory results for the estimated LDMEs [29,30,31,32,33,34,35]. The second core topic of this thesis is an attempt to clarify this situation by introducing an original phenomenological interpretation of the LHC results [36], characterized by a meticulously developed global fit framework, providing the possibility for a detailed study of the quarkonium production cross section and polarization observables, simultaneously and consistently treating these highly correlated measurements.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Quarkonium Polarization to Probe QCD at the LHC

Knünz

2017

Springer Theses

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The Compact Muon Solenoid (CMS) detector is ideally suited to study quarkonium production in the experimentally very clean dimuon decay channel, up to considerably higher values of transverse momentum than accessible in previous experiments. The scope of this thesis is to describe in detail the measurements of the polarizations of the Υ(nS) bottomonium states and (in less detail) of the ψ(nS) charmonium states, based on a dimuon data sample collected with the CMS detector in proton-proton collisions at a center-of-mass energy of 7 TeV. Surprisingly, no significant polarizations were found in any of the studied quarkonium states, in none of the studied reference frames, nor in a frame-independent analysis. From an experimental point of view, these results, together with recent results from other experiments, clarify the confusing picture originating from previous measurements, which were plagued by experimental ambiguities and inconsistencies.The currently most favored approach to model and understand quarkonium production is non-relativistic quantum chromodynamics (NRQCD), a QCD-inspired model which allows color-octet pre-resonant quark-antiquark states to contribute to quarkonium bound state formation. The measurements obtained as a result of this work, together with other LHC measurements in the field of quarkonium production, are interpreted with an original phenomenological approach within the theoretical framework of NRQCD, guided by the observation of a few general features of the data, and corroborated by a detailed study of the quarkonium production cross section and polarization observables.This phenomenological analysis leads to a coherent picture of quarkonium production cross sections and polarizations within a simple model, dominated by one single coloroctet production mechanism. These findings provide new insight in the dynamics of heavy quarkonium production at the LHC, an important step towards a satisfactory understanding of hadron formation within the standard model.

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J/ψ(ψ′)Production at the Tevatron and LHC atO(αs4

Cited by 277 publications

References 37 publications

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

J/ψ and ψ(2S) production in pp collisions at $ \sqrt {s} = 7{\text{Tev}} $

Measurement of Quarkonium Polarization to Probe QCD at the LHC

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